Modular structure-based three-port power electronic transformer

Abstract

The invention belongs to the technical field of power equipment and relates to a modular structure-based three-port power electronic transformer. The modular structure-based three-port power electronic transformer comprises a radiator, a top seat and insulating caps; the top of the radiator is fixedly connected with the top seat through a bolt; the length of the top seat is larger than that of theradiator; the top of the top seat is in threaded connection with high-voltage bushings; and the tops of the high-voltage bushings are in threaded connection with the insulating caps. According to themodular structure-based three-port power electronic transformer of the invention, accessories are combined; a module series structure is adopted to bear high-voltage side voltages; a power device issimplified, meanwhile, the complexity of the transformer is improved; main boards and auxiliary boards which are made of expanded graphite compressed plates are arranged in the additionally-arranged insulating caps, and therefore, internal space isolation can be carried out on the basis of the preheating expansion filling characteristic of expanded graphite when a high-temperature combustion condition occurs while lines are limited and fixed, and thus, open fire combustion risks are reduced, and the insulating property and safety degree of the transformer are high.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a three-port power electronic transformer based on a modular structure. Background technique [0002] Power electronic transformer, also known as solid-state transformer, is a new type of power equipment that uses power electronic conversion technology to realize functions such as voltage conversion and energy transfer. It will become one of the key equipment for future active distribution networks. Its basic working principle is to convert high voltage The side power frequency alternating current is obtained through a series of transformations (AC-AC or AC-DC-AC) of the power electronic converter to obtain high-frequency alternating current, and then coupled to the low-voltage side through a high-frequency transformer, and then through a series of transformations of the converter to obtain the power Frequency alternating current to supply power to the load. The size of ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a three-port power electronic transformer based on a modular structure, to solve the outstanding advantages of the existing power electronic transformer proposed in the above background technology compared with the traditional transformer, and to meet many new requirements of the future power system. Including: higher stability, more flexible power transmission methods, integration of various AC and DC distributed power sources, realization of parallel operation with the power grid, and combination with the DC distribution network to realize real-time control of the power flow in the power market. As mentioned above, the multi-port power electronic converter is considered to be a necessary way for renewable energy grid-connected power generation and efficient use of electric energy, and is an important development direction of smart grid and power electronics. The module series structure cannot effectively avoid water intrusion during wiring, and in the face of the danger of burning, it lacks barrier treatment methods and poor insulation, which is very easy to further lead to the problem of increased losses

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